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Palomar: Cosmic Web Imager

Palomar: Cosmic Web Imager. Who are CWI? Khanh Bui (Structure design) Daphne Chang (Opto-mechanical lead, GRA) Matt Matuszewski (Grating, articulation unit, GRA) Chris Martin (PI) Anna Moore (System Lead) Patrick Morrissey (Detector) Shahin Rahman (Software, GRA) What is CWI?

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Palomar: Cosmic Web Imager

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  1. Palomar: Cosmic Web Imager Who are CWI? • Khanh Bui (Structure design) • Daphne Chang (Opto-mechanical lead, GRA) • Matt Matuszewski (Grating, articulation unit, GRA) • Chris Martin (PI) • Anna Moore (System Lead) • Patrick Morrissey (Detector) • Shahin Rahman (Software, GRA) What is CWI? • Optical spectrograph for 200” Hale telescope designed specifically for high resolution spectroscopy of low-surface-brightness extended emission with exquisite sky background subtraction • Based on slicer-IFU, 50” FoV, R~5000 Science goal: • Science goal is to directly detect faint cosmic web and circum-galactic medium emission at high redshifts • First light late 2008 CWI shown mounted to the Cassegrain station of the 200” Hale telescope, without enclosure

  2. Palomar: Cosmic Web Imager The camera and dewar assembly must rotate about the center of the grating Collimator IFU VPH grating Camera and dewar Side view/zenith pointing

  3. Infrared Imaging Spectrograph(IRIS) Concept Design • James Larkin PI (UCLA) • Anna Moore co-PI (Caltech) • First light instrument for TMT (2016?) • ~1 year CODR study with review in Feb 2009 • ~450k study, 1/3rd to COO • 0.8-2.5mm, imager and IFU R<4000 • Imager: FoV 10” goal • IFU(lenslet): 4/9 mas/pixel; 2” FoV • IFU(slicer): 22/50 mas/pixel • Spectrograph offers high strehl lenslet and high efficiency slicer • Large part of CODR is to combine lenslet and slicer optics efficiently

  4. 2.25m 4.25m IRIS Envelope Dimensions • The generic instrument envelope is a 2m dia. cylinder extending 3.75m axially from the interface plane • A “snout” portion protrudes 0.5m into NFIRAOS • Maximum total instrument length = 4.25m • The instrument centre of mass is required to lie on axis, 2.25m from the interface plane SNOUT 0.5m INTERFACE PLANE ROTATOR BEARING e.g. ROLLIX 02-1415-00 C of M (5T)

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